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TROJ_BUZUS.EO

October 08, 2012
 ALIASES:

TrojanDownloader:Win32/Renos.KC (Microsoft)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

This file contains a URL where it connects to possibly download other files. It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

336,303 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

11 Mar 2011

Payload:

Modifies HOSTS file

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan drops and executes the following files:

  • %System%\msxmlrr.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random} = "%System%\msxmlrr.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\GHUZPSK

HKEY_LOCAL_MACHINE\SOFTWARE\GHUZPSK

It adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\GHUZPSK
{random} = "{hex values}"

HKEY_LOCAL_MACHINE\SOFTWARE\GHUZPSK
{random} = "{hex values}"

HOSTS File Modification

This Trojan overwrites the system's HOSTS files to prevent users from accessing the following websites:

  • thepiratebay.org
  • www.thepiratebay.org
  • mininova.org
  • www.mininova.org
  • forum.mininova.org
  • blog.mininova.org
  • suprbay.org
  • www.suprbay.org

Other Details

This file contains a URL where it connects to possibly download other files. As of this writing, this file contains the following URLs:

  • {BLOCKED}ebspeed.net/html/license_{hex values}

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

8.900

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
    • {random} = %System%\msxmlrr.exe

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software
    • GHUZPSK
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • GHUZPSK

Step 4

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %System%\msxmlrr.exe

Step 5

Remove these strings added by the malware/grayware/spyware in the HOSTS file

[ Learn More ]
    • 127.0.0.1 thepiratebay.org
    • 127.0.0.1 www .thepiratebay.org
    • 127.0.0.1 mininova.org
    • 127.0.0.1 www .mininova.org
    • 127.0.0.1 forum.mininova.org
    • 127.0.0.1 blog.mininova.org
    • 127.0.0.1 suprbay.org
    • 127.0.0.1 www .suprbay.org
"

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_BUZUS.EO. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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